َQuiz Nova

QuizNova — Full-Stack Quiz Management System

A comprehensive quiz management platform built with .NET 10, Angular 21, PostgreSQL, and SignalR.

Key Features:

- Role-based access control (Admin, Instructor, Student) with custom permissions

- Gradual quiz engine supporting MCQ, True/False, and Essay questions with real-time grading

- Real-time course chat rooms powered by SignalR with emoji reactions

- Security & rate limiting (global, auth, and submit-quiz policies)

- Full observability stack: OpenTelemetry, Serilog, Prometheus, Grafana, Seq, Loki

Backend Architecture:

- Clean Architecture with CQRS/MediatR pipeline behaviors

- Result pattern (no exceptions for control flow)

- Hybrid Cache (L1 in-process + L2 PostgreSQL) — no Redis needed

- Transactional outbox with PostgreSQL LISTEN/NOTIFY for reliable event dispatching

- Polymorphic question model following Liskov Substitution Principle

Frontend Architecture:

- Angular 21 with Signals and NgRx Signal Store for state management

- PrimeNG 21 component library

- Atomic layout using NgComponentOutlet for polymorphic question rendering

- Route guards and JWT auth interceptor with silent token refresh

Testing:

- Four-layer test pyramid: Domain unit tests, Application unit tests, Subcutaneous tests (real DB), Integration tests (TestContainers)

- Playwright E2E tests with Page Object Model

CI/CD:

- GitHub Actions with parallel backend/frontend pipelines

- Frontend deployed to GitHub Pages

- Backend containerized and published to GitHub Container Registry

- Docker Compose for local development